FIGURE 5. Comparative leaf and floral images. A–C. Isoglossa laxiflora. A–B. Leaves. C. Flower, lateral view. D–E. Isoglossa humbertii. D. Leaf. E. Flower, lateral view. F–G. Isoglossa darbyshirei. F. Leaf. G in Isoglossa darbyshirei (Acanthaceae), a new plietesial species from the Albertine Rift (Rwanda, Burundi)

FIGURE 5. Comparative leaf and floral images. A–C. Isoglossa laxiflora. A–B. Leaves. C. Flower, lateral view. D–E. Isoglossa humbertii. D. Leaf. E. Flower, lateral view. F–G. Isoglossa darbyshirei. F. Leaf. G. Corolla, lateral view. All drawn by E. Fischer from Dumbo s.n. (A), Fischer 462/11 (B–C), Stauffer 1121 (D–E) and Fischer 788/16 (F–G).